The study aimed to assess the validity and reliability of the Edmonton Frail Scale (EFS) in a sample referred for comprehensive geriatric assessment (CGA). The EFS is a brief, user-friendly screening tool designed for use by non-specialists in both inpatient and outpatient settings. The study included 158 participants aged 65 years and older, with a mean age of 80.4 years. The EFS was administered by a lay research assistant and correlated significantly with the Geriatrician's Clinical Impression of Frailty (GCIF), age, and medication count but not with sex. Inpatient participants had higher EFS scores than outpatient participants, and those living with assistance had higher scores than those living independently. The EFS showed good inter-rater reliability (κ = 0.77) and acceptable internal consistency (Cronbach’s α = 0.62). The EFS was also validated in non-specialists, making it a practical and clinically meaningful measure of frailty. However, caution is advised when generalizing these findings to unscreened community populations or narrow research populations. The study highlights the need for further research to validate the EFS in other settings and evaluate its responsiveness.The study aimed to assess the validity and reliability of the Edmonton Frail Scale (EFS) in a sample referred for comprehensive geriatric assessment (CGA). The EFS is a brief, user-friendly screening tool designed for use by non-specialists in both inpatient and outpatient settings. The study included 158 participants aged 65 years and older, with a mean age of 80.4 years. The EFS was administered by a lay research assistant and correlated significantly with the Geriatrician's Clinical Impression of Frailty (GCIF), age, and medication count but not with sex. Inpatient participants had higher EFS scores than outpatient participants, and those living with assistance had higher scores than those living independently. The EFS showed good inter-rater reliability (κ = 0.77) and acceptable internal consistency (Cronbach’s α = 0.62). The EFS was also validated in non-specialists, making it a practical and clinically meaningful measure of frailty. However, caution is advised when generalizing these findings to unscreened community populations or narrow research populations. The study highlights the need for further research to validate the EFS in other settings and evaluate its responsiveness.